Question

During a marathon race an athlete loses 2 % of his mass.

At the end of the race his mass is 67.13 kg.
Calculate his mass before the race.

Answer 1

his mass before the race was 68.5kg

Explanation:

let,his mass before the race was 'x'

By question,

x-2% of x =67.13

or,x- 2x/100=67.13

or, 98x/100=67.13

or,98x=67.13×100

or,98x=6713

or,x=6713÷98

or,x=68.5

thus,his mass before the race was 68.5 kg